2009831656 has 32 divisors (see below), whose sum is σ = 4388048640. Its totient is φ = 845103168.

The previous prime is 2009831651. The next prime is 2009831657. The reversal of 2009831656 is 6561389002.

It is not an unprimeable number, because it can be changed into a prime (2009831651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 335616 + ... + 341551.

It is an arithmetic number, because the mean of its divisors is an integer number (137126520).

Almost surely, 2^2009831656 is an apocalyptic number.

It is an amenable number.

2009831656 is an abundant number, since it is smaller than the sum of its proper divisors (2378216984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2009831656 is a wasteful number, since it uses less digits than its factorization.

2009831656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677233 (or 677229 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 2009831656 is about 44831.1460482553. The cubic root of 2009831656 is about 1261.9821945561.

The spelling of 2009831656 in words is "two billion, nine million, eight hundred thirty-one thousand, six hundred fifty-six".